Groovy function accessible to all tests

Hi,

I am using the free version of SOAPUI 2.5.1 and I am trying to write a function or subroutine that I can use or call from any groovy script test step. Ex.

// this is the part i want to be reusable in any test step from any test case
// in the same test suite...

// subroutine example
def add (num1, num2) {
num1 + num2
}



// an example of the calling line that i can call in any groovy script test step
// from any test case belonging to the same test suite

log.info "" + add(1, 2)


Any help is much appreciated.

Thanks.